INDEX 



Mustards, 95 



Myriapods, 154 



Myriophyllum, 39, 48, 55, 

 58, 90, 117, 122, 170, 192, 

 304, 309; spicatum, 99- 

 100 



NaidcB, 144 

 Nats, 16, 145-146 

 NajadacecB (pond weeds), 73- 



75 

 Natrix sipedon, subspecies 



sipedon, 404-406 



NaucoridcB (creeping water- 

 bugs), 227, 238 



NecturidcB (mud-puppies), 

 366-368 



Necturus maculosus, 366-368 



Needham, J. G., 19, 36, 2>7^ 

 115, 150, 195, 201, 234, 

 287 



Needham, J. G., and Need- 

 ham, P., 24T, 264 



Needham, J. G., and William- 

 son, H. v., 263 



Ncniatoda (threadworms) , 

 140-141 



Nematodes, 100, 103, 139, 

 140-141 



Nepa apiculata, 235-236 



NepidcB (water scorpions) , 

 227, 235-237 



Nets, water, for collecting, 26 



Neuronia, 253-254 



Netiroptcra (alderflies, dob- 

 sons, fish-fies), 179, 189, 

 190, 240-247; aquarium 

 study, 241 ; form and 

 habits, 240; key to larvas, 

 241; occurrence, 240-241; 

 SialidcF, 241-245; Sisyridce, 

 241, 245-246 



Newts, 207, 353-357; red, 

 347, 352, 353-357; spotted, 



351,353-357 

 Nitella, 31, 53, 54, 55, 116, 



117, 170, 265, 266, 275, 



304 

 "No-see-ums", 292 

 Nonagria oblonga, 70 

 Notonecta, 192; irrorata, 237; 



undulata, 237 



Notonectidce (backs wimmers), 



227,237-238 

 Notropis cornuhis, 335-336 

 Nymph, definition, 185, 188 

 Nymphcea advena, 91-93; 



micro phylla, 93 

 NymphcBacece (water-lilies), 



91-95 



Nymphula, 75, 93, 258; macn- 

 lalis, 258-259; obliterans, 

 259-261 



Nymphidince, 258 



Odonata (dragonflies and 

 damselflies), 179, 189, 213- 

 225; ^^schinincE, 218-220; 

 A nisoptera , 2 1 6-2 2 o ; 



Gomphince, 218; LibelhdidcB 

 216-220; Zygoptera, 220- 

 225 



OdontoceridcB, 255 



Oligochcota (bristleworms), 



139, 143-147 



Oscillatoria, 48 



Ostracoda (ostracods), 160, 



161, 168 

 Oxygen, in aquaria, 38, 39, 



40; in water, 9; relation of, 



to food content of water, 



9, 10 



Pails, covered, for collecting, 



26 

 PaludicellidcE, 1 3^-1 35 

 Paludicella ehrenbergii, 134- 



135 

 Paragordius variiis, 142, 143 



Paramcecium, 36 



Parasites, 141, 153, 175, 178, 



230, 231; flatworms, 119; 



sponge, 109 

 Parthenogenesis, Crustacea, 



159 



Partnerships, animal and 



plant, 59 

 Pectinatella, 131, T33, 137- 



138. 165 

 Pediastrum, 260 



Pedicia, 285; albivitta, 289 



Pelecypoda, 301-304, 315- 



323; SpharidcB, 321-323; 



UnionidcB, 320-321 



442 



